Answer:
7.5 × 10¹⁹ molecules Fe₂O₃
General Formulas and Concepts:
Chemistry - Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
7.5 × 10¹⁹ particles Fe₂O₃
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[tex]7.5 \cdot 10^{19} \ particles \ Fe_2O_3(\frac{6.022 \cdot 10^{23} \ molecules \ Fe_2O_3}{6.022 \cdot 10^{23} \ particles \ Fe_2O_3} )[/tex] = 7.5 × 10¹⁹ molecules Fe₂O₃
An ionic bond is made from a ___ and a ___.
Le Châtelier's principle applies to gas exchange reactions in human lungs.
Carbon dioxide gas combines with water in the blood to form carbonic acid:
H2O + CO2 = H2CO3
During exercise, the concentration of CO2 in the blood increases. How would
this affect the reaction's equilibrium?
A. It would favor the forward reaction.
B. It would favor the backward reaction.
C. It would maintain the reaction's equilibrium.
D. More information is needed to assess the reaction's equilibrium.
Answer:
The correct option is;
A. It would favor the forward reaction
Explanation:
Le C_h_a_t_e_l_i_e_r_'s principle states that for a system in dynamic equilibrium a change in the volume, pressure, concentration, or temperature will cause a predictable shift in the reaction to bring about a shift in the equilibrium position which counteracts the change and bring about the establishment of a new equilibrium
Therefore, in the reaction, H₂O + CO₂ → H₂CO₃, we have;
An increase in the amount of the CO₂ concentration in the blood, increases the quantity of the reactants more than the quantity present at equilibrium, therefore, the number of reaction between the H₂O and the CO₂ increases resulting in the formation of more H₂CO₃, therefore, favoring the forward reaction.
Answer:
A. It would favor the forward reaction.
Explanation:
A.P.E.X
____________________________ the cell organelle where cellular respiration occurs.
Answer:
Mitochondrion is the cell organelle where cellular respiration occurs.
Hope it helps ^^
Answer:
Mitochondria
I hope this helps!
PLEASE HELP ASAP!!!!!!!!
Answer:
You need to count all the atoms on each side of the chemical equation. once you know how many of each type of atom you have,you can only change the coefficient. (the numbers in front of the atoms or compounds
Why does the half-life of cancer treatment decay?
Answer:
The decay of radioactive elements occurs at a fixed rate. The half-life of a radioisotope is the time required for one half of the amount of unstable material to degrade into a more stable material. For example, a source will have an intensity of 100% when new. At one half-life, its intensity will be cut into 50% of the original intensity.
Explanation:
A solution is prepared by dissolving 250 g of CH4N2O into 6.0 L of solution. What is the molarity of this solution?
________M
Answer:
Molarity = 0.65 M
Explanation:
Given data:
Mass of CH₄N₂O = 250 g
Volume of solution = 6.0 L
Molarity of solution = ?
Solution:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
Number of moles of solute:
Number of moles = mass/molar mass
Number of moles = 250 g/ 64.08 g/mol
Number of moles = 3.9 mol
by putting values,
Molarity = 3.9 mol / 6.0 L
Molarity = 0.65 M
7. What is the name of: CH3-CH(CH3)-CH2- alky group? *
isopropyl
propyl
sec-butyl
butyl
Answer:
propyl
1-propylmethane or 2-methylpropane
If the potato solution was boiled for 10 minutes and cooled for 10 minutes before being tested, the average time for the disks to float to the surface of the hydrogen peroxide solution would be___________.
Answer:
more than 30 seconds
Explanation:
theres some extra
question : To study the actions of the enzyme catalase on hydrogen peroxide, students performed the following experiment. Catalase was extracted from potatoes and stored on ice. The following hydrogen peroxide solutions were made: 1%, 5%, 10%, 15%. Filter paper disks were soaked in the catalase then dropped into each of the solutions. Enzyme activity was measured by the time it took for the disks to float from the bubbles produced. Here is the data:
Which of the following best describes why the disks float faster to the surface in more concentrated solutions?
asnwer
the higher substrate concentrations in the more concentrated solutions speeded up the reaction
yw!
How many moles of Cl in 38.5 mol of CCl2F2?
Answer:
77 moles
Explanation:
The given chemical compound is CCl2F2 is called Dichlorodifluoromethane. In CCl2F2, we have:
one mole of a Carbon atom.
two moles of Chlorine atom; &
two moles of Fluorine atom.
Given that one mole of Chlorine = 38.5 moles.
Then, two moles will be:
= 2 × 38.5 moles
= 77 moles
where are the largest elements
Answer:
the first two elements of array are checked and the largest of these two elements are placed in arr[0]
the first and third elements are checked and largest of these two elements is placed in arr[0] .
this process continues until the first and last elements are checked.
Explanation:
Then you would find the largest Elements
Answer:
Atomic radii vary in a predictable way across the periodic table. As can be seen in the figures below, the atomic radius increases from top to bottom in a group, and decreases from left to right across a period. Thus, helium is the smallest element, and francium is the largest.
PLEASE HELP I'LL GIVE YOU BRAINLIEST!!
What is a compound?
A. the center of an atom that is formed by neutrons, protons, and electrons
B. a tiny particle that makes up all matter
C. a molecule that is formed from two or more different types of atoms.
D. a molecule that is formed from the same type of atoms
Answer:
C
Explanation:
While looking in the sky, you notice birds that are soaring but not moving their wings. How is it possible that they are still flying?
Which cup has more thermal energy?
2 liter cup of milk
1 liter cup of milk
Both have the same amount of thermal energy
Question: Which cup has more thermal energy?
A. 2 liter cup of milk
B. 1 liter cup of milk
Answer: A. 2 liter cup of milk
Explanation:
We have milk in both of the containers. The milk in both containers is the same temperature, so we will have to measure the amount of molecules. The amount of molecules makes it warmer, and if it is warmer, that is more energy. 2 liters have more thermal energy than 1 liter, because it has more molecules.
Our answer is 2 liter cup of milk.
An element X on reacting with oxygen forms an oxide X2O. this oxide dissolves in water and turns blue litmus red. a) Identify the element X and mention the nature of the compound formed. b) Write a balanced chemical equation for the above reaction
Answer:
The unknown element is Carbon.
(a) X is Carbon, its oxide is of acidic nature
(b) C+ O2 → CO2
Explanation:
We are given an unknown element that reacts with oxygen.
X + O2 → XO2
It is given that the oxide XO2 turns blue litmus red which is shown by acids, so XO2 is an acidic oxide. Also X will be a Non metal because Non metallic oxide is Acidic in nature.
The Oxide XO2 is dissolving is water. The oxide upon reacting with water will give an Acid.
XO2 type of oxide is found in the 14th group of the periodic table generally
So we have options like C, Si and Ge as these only have the Acidic oxide.
But when it comes to reactivity with water Only Carbon satisfies the need so the unknown element X is C.
CO2 + H2O → H2CO3 which is an acid.
(a) Element X is Carbon (C), The nature of the compound formed is Acidic.
(b) The reaction given will be as follows
C+ O2 → CO2
Therefore the unknown element is Carbon.
How many moles of sucrose are dissolved in 250 mL of solution if the solution concentration is 0.150 M?
Answer:
plz refer to the attachment above .
The number of moles of sucrose dissolved in 250 mL of solution will be = 0.375.
What is Molarity?The total number of moles of solute in a given solution's molarity is expressed as moles of solute per litre of solution. As opposed to mass, which fluctuates with changes in the system's physical circumstances, the volume of a solution depends on changes in the system's physical conditions, such as pressure and temperature.
M, sometimes known as a molar, stands for molarity. When one gramme of solute dissolves in one litre of solution, the solution has a molarity of one. Since the solvent and solute combine to form a solution in a solution, the total volume of the solution is measured.
Molarity Formula: (number of moles of solute) / volume
The ratio of the moles of the solute whose molarity needs to be computed to the volume of solvent needed to dissolve the supplied solute is the equation for determining molarity.
Molarity = (number of moles of solute) / volume
0.15 * 250/1000 = number of moles
Number of moles = 15/100 * 25/100 = 0.375
Therefore, the number of moles of sucrose dissolved would be 0.375.
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The______________ the maximum amount of product that could be formed from the given amounts of reactants. The _______ is the amount of product that is actually formed when the reaction is carried out in the laboratory. The ___________ is the ratio of the actual yield to the theoretical yield, expressed as a percentage.
1.percent yield
2.theoretical yield
3.actual yield
HELP ASAP 50 POINTS & WILL BE MARKED BRAINLY
The Theoretical yield is the highest amount of product that could be formed from the allocated amounts of reactants.
What is Theoretical yield?
The Theoretical yield is the greatest amount of product that could be formed from the given quantities of reactants.
The Actual yield is the quantity of product that is formed when the response is carried out in the laboratory.
The Percent yield is the ratio of the authentic yield to the theoretical yield, described as a percentage.
Percentage Yield Formula: When the product that we are obtained after a chemical reaction is known as the yield. We can estimate this accepted yield in moles or grams.
It is the ‘authentic yield’ that we acquire after the completion of a chemical reaction. Separated from this, established on our estimation, we calculate the anticipated yield of a reaction comprehended as the ‘theoretical yield.’
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Which of these is a sentence fragment?
The dog barked.
The skateboard wiggled back and forth.
The dog that was riding a skateboard.
We laughed at the dog on the skateboard.
Answer:
the dog barked is the answer
Genes are found inside chromosomes and DNA is contained in the genes.
True
False
I believe that's true.
Mention any two variables of Ideal Gas law
Answer:
Pressure (P) , Volume (V) , Temperature (T)
Explanation:
An ideal gas has three variables that define its state. They are: absolute pressure (P), volume (V), and absolute temperature (T). The ideal gas law defines how these state variables relate to each other
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How would Earths revolution be affected if it had a larger orbit??
Answer:
When the Earth rotates on its axis, it prevents air currents from going in a straight line to the north and the south from the equator. It results in one of the effects of rotation of the Earth: the Coriolis Effect.
Whats a formula for calcium hydroxide?
Answer:
Ca(OH)2
Explanation:
When 2 or more different atoms chemically combine A. Element B. Compound
Answer:
compound
Explanation:
Answer:
compound
Explanation:
A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds. When two hydrogen atoms combine with one oxygen atom, it becomes the compound water
What actions can you take to reduce your impact on science?
Answer:
Don't travel by air if you can avoid it because air travel uses up large amounts of fossil fuels and creates greenhouse gases. Dispose of any rubbish responsibly - it can be hazardous to wildlife. Use public transport, cycle or walk instead of using a car. Use facilities and trips run by local people whenever possible.
Answer:
Practicing recycling and green computing
2. How would a small change in the Sun's radiation affect our
ecosystems?
Answer: It could burn or freeze anything
Explanation:
Answer:
The carcinogen (U.V.) helps to stabilize the formation of clouds and maintain life in ecosystem.
If drastic changes were made to the radiation of sun, it will lead to ecological imbalance such as changes in O3 layer, etc and surely, the last day (D-day, what we majorly call) will come!
Where must you be standing if the Sun appears to be directly overhead at noon?
O A. At the South Pole
O B. At the North Pole
O C. At a point somewhere along the prime meridian
O D. At a point somewhere along the equator
Answer:
D
Explanation:
at a point somewhere along the equator
In the case when the Sun appears to be directly overhead at noon should be along with the equator.
What is the equator?It is considered to be the imaginary line that should be arounded with the middle of the planet or the celestial body. It is halfway that lies between the North Pole and the South Pole, at 0 degrees latitude. In the equator, it divides the planet into a Northern Hemisphere and a Southern Hemisphere
Therefore, based on the above explanation, the option d is correct.
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CrO3 = Cr2O3 + O2
how do i balance this?
Answer:
4cro3=2cr2o3+3o2
Explanation:
on left hand side there is 4cr and 12o where as now on wright hand side we have 4cro6+6o which makes 4cr and 12o which is equal to the left hand side.
Answer:
4CrO3====> 2 Cr2O3 + 3O2
Explanation:
Before dealing with the Cr, I think you might want to deal to work with the oxygen in Cr2O3
You might want to turn that into an even number. You could put a 2 in front of the Cr2O3, but looking ahead, I can see that will give you a fractional amount for the O2. So I'll use a 4
CrO3 ===> 4 Cr2O3 + O2
That means you have 8 Cr s on the right. Balance that on the left
8CrO3 =====> 4 Cr2O3 + O2
You've balanced The Cr s. So now lets look at the oxygens. There are 8*3 oxygens on the left hand side. The right has 12 + 2. Don't touch the Cr2O3. You are done with them.
You need 12 more oxygens on the right. You have 2. So multiply the Oxygens by 6
8CrO3 ===> 4 Cr2O3 + 6 O2 There's a factor of 2 common. Divide by 2
4CrO3====> 2 Cr2O3 + 3O2
THIS IS DUR IN LIKE 15 MINS PLS
Answer:
A. Wisconsin
Explanation:
In the graph, Wisconsin has the highest speed limit.
Guys please help me this is for a final
What happens when you change only the number of electrons inside of an atom
Answer: Changing the number of electrons will change the overall charge on an atom.
Explanation:
An atom that loses electrons will become positively charged and an atom with added electrons will become negatively charged. ... A charged atom is called an ion.
Describe one way that grazing animals, such as bison or cattle, help to maintain grassland ecosystems.
Answer:
They fertilize the land and help with overgrowth.
Explanation:
The one way that grazing animals help to maintain grassland ecosystems is: It enhance the plant to grow.
Ecosystems enables both living organisms such as animals and non living organisms such as plant to communicate with one another in an environment.
Grazing animals is essential as it help to maintain the grassland ecosystems by quicken and boosting the growth of plant which inturn help to maintain a very healthy and sustainable ecosystems.
Grazing lead to the restoration of habitat as it help to restore back any form of damaged that occur to the natural resources of ecosystems.
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What is removed in the sedimentation process
suspended solids from water